57 lines
2.6 KiB
Python
57 lines
2.6 KiB
Python
import asyncio
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from langchain_mcp_adapters.tools import load_mcp_tools
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from mcp import ClientSession, StdioServerParameters
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from mcp.client.stdio import stdio_client
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# 配置mcp服务器脚本路径
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server_script = r".\stdio_server.py"
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# 配置mcp服务器启动参数
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server_params = StdioServerParameters(
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command="python" if server_script.endswith(".py") else "node",
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args=[server_script],
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)
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# 定义mcp客户端
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mcp_client = None
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# 主要的异步函数run_agent
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async def run():
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global mcp_client
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# 启动 MCP server，并通过标准输入输出建立异步连接。
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async with stdio_client(server_params) as (read, write):
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# 使用读写通道创建 MCP 会话。
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async with ClientSession(read, write) as session:
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await session.initialize()
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# 动态创建一个临时类 MCPClientHolder，把 session 放进去。这样就可以在函数外部通过 mcp_client.session 调用 MCP 工具
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mcp_client = type("MCPClientHolder", (), {"session": session})()
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# 从 session 自动获取 MCP server 提供的工具列表。
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tools = await load_mcp_tools(session)
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print(f"tools-->{tools}")
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# 调用 MCP server 的 get_weather 工具
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response = await session.call_tool("get_weather", arguments={})
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print(f"response-->{response}")
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return
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# 启动运行
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if __name__ == "__main__":
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asyncio.run(run())
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# tools -->[StructuredTool(name='query_high_frequency_question',
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# description='从知识库中检索常见问题解答（FAQ）,返回包含问题和答案的结构化JSON数据。',
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# args_schema={'properties': {}, 'title': 'query_high_frequency_questionArguments',
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# 'type': 'object'}, response_format='content_and_artifact',
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# coroutine= < function convert_mcp_tool_to_langchain_tool. < locals >.call_tool
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# at
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# 0x000001DB7A188FE0 >), StructuredTool(name='get_weather', description='查询天气',
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# args_schema={'properties': {}, 'title': 'get_weatherArguments',
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# 'type': 'object'}, response_format='content_and_artifact',
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# coroutine= < function
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# convert_mcp_tool_to_langchain_tool. < locals >.call_tool
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# at
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# 0x000001DB7A1E3060 >)]
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# response -->meta = None
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# content = [TextContent(type='text', text='北京的天气是多云', annotations=None, meta=None)]
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# structuredContent = {'result': '北京的天气是多云'}
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# isError = False |